Vipul Kumar.
Android engineer who designs. A dozen shipped products in twelve years, and a side project, Kafka, that grew into a reading app on Android, iOS and web.
A reading app for Hindi, Urdu and English classics, built alone on Kotlin Multiplatform: 3,000 books, 1,000 audiobooks, 50K+ installs, rated 4.98 on Play.
Founder and sole engineer, built alone. See the work
Built the Android app from scratch for Billion Hearts: on-device ML, end-to-end encryption, a sync that survives OEM battery limits. Launched to 27 countries, 75x growth in two months.
Founding Android engineer · 2025 to 2026. See the work
A new Android app in Jetpack Compose in five months as the sole contributor: 35+ modules.
Sole Android contributor · 2023 to 2025. See the work
Tech lead for the rider app across three teams in Berlin, and led the redesign that carried orders up 120 percent; riders from 1.2M to 2.8M a month.
Delivery Hero, Berlin · 2020 to 2023. See the work
PicSee
India, remote
Twelve years, six products.
2014Where it started: the Android side of a location-tracking framework at a two-person startup, acquired by Zomato within six months.
Kafka, up close.
Android, iOS and web · 50K+ installs · 4.98 on Play
Its own book format and reader: justified text, drop caps, a page curl, selection across paragraphs, and a dictionary under every word.
90%
of Kafka's code is shared between Android and iOS
- 107K
- lines of shared Kotlin
- 8.6K
- Android only
- 3.4K
- iOS only
About.
I have built Android apps for twelve years: a travel app for slow networks at Yatra, the launcher on Airtel's TV box, the rider app behind Delivery Hero's brands in Berlin, and now Kafka, alone, on Android, iOS and web.
I care about what a user feels before they can name it: how text sets, how a screen moves, how an app holds up on a cheap phone at the end of a long day. I also write Urdu poetry; Kafka began as a place to read the poets I love.
Based in India, working remotely. Open to lead roles and Kotlin Multiplatform contracts.